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Closed Access item Properties of the 7He ground state from 8He neutron knockout

Authors:Aksyutina, Yu.
Johansson, H. T.
Aumann, T.
Boretzky, K.
García Borge, María José
Chatillon, A.
Chulkov, L. V.
Cortina-Gil, D.
Datta Pramanik, U.
Emling, H.
Forssén, C.
Fynbo, H. O. U.
Geissel, H.
Ickert, G.
Jonson, B.
Kulessa, R.
Langer, C.
Lantz, M.
LeBleis, T.
Lindahl, A. O.
Mahata, K.
Meister, M.
Münzenberg, G.
Nilsson, T.
Nyman, G.
Palit, R.
Paschalis, S.
Prokopowicz, W.
Reifarth, R.
Richter, Achim W.
Riisager, K.
Schrieder, G.
Simon, H.
Sümmerer, K.
Tengblad, Olof
Weick, H.
Zhukov, M. V.
Keywords:[PACS] Properties of specific nuclei listed by mass ranges: 6 ≤ A ≤ 19
Issue Date:28-Jul-2009
Citation:Physics Letters B 679(3): 191–196 (2009)
Abstract:The unbound nucleus 7He, produced in neutron-knockout reactions with a 240 MeV/u 8He beam in a liquid-hydrogen target, has been studied in an experiment at the ALADIN-LAND setup at GSI. From an R-matrix analysis the resonance parameters for 7He as well as the spectroscopic factor for the 6He(0+)+n configuration in its ground-state have been obtained. The spectroscopic factor is 0.61 confirming that 7He is not a pure single-particle state. An analysis of 5He data from neutron-knockout reactions of 6He in a carbon target reveals the presence of an s-wave component at low energies in the α +n relative energy spectrum. A possible low-lying exited state in 7He observed in neutron knockout data from 8He in a carbon target and tentatively interpreted as a Iπ = 1/2− state, could not be observed in the present experiment. Possible explanations of the shape difference between the 7He resonance obtained in the two knockout reactions are discussed in terms of target-dependence or different reaction mechanisms at relativistic energies.
Description:6 pages, 3 tables, 3 figures.--PACS nrs.: 27.20.+n.--Printes version published Aug 24, 2009
Publisher version (URL):http://dx.doi.org/10.1016/j.physletb.2009.07.044
Appears in Collections:(CFMAC-IEM) Artículos

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